Substituted-1,2,3,4-tetrahydrobenzothieno 2,3-pyridine



United States Patent 3,518,278 SUBSTITUTED-1,2,3,4-TETRAHYDROBENZO- THIENO 2,3-PYRIDINE John T. Suh, Mequon, Wis., assignor to Colgate-Palmolive Company, New York, N.Y., a corporation of Delaware No Drawing. Continuation-impart of application Ser. No. 705,909, Feb. 16, 1968, which is a continuation-in-part of application Ser. No. 621,475, Mar. 8, 1967. This application Mar. 20, 1969, Ser. No. 809,003

Int. Cl. C07d 31/50 US. Cl. 260-2943 6 Claims ABSTRACT OF THE DISCLOSURE The compounds are substituted-1,2,3,4-tetrahydrobenzothieno[2,3-c]pyridine useful as central nervous system depressants and tranquilizing agents. A compound disclosed is 6-chloro 1,2,3,4 tetrahydrobenzothieno[2,3-c] pyridine.

RELATED CASES The present application is a continuation-in-part of my copending application Ser. No. 705,909 filed Feb. 1 6, 1968, which is in turn a continuation-in-part of my earlier application Ser. No. 621,475 filed Mar. 8, 1967, now abandoned.

DETAILED DESCRIPTION The compounds of the present invention have the following formula:

Formula I wherein A and A 'are selected from hydrogen, hydroxy, nitro, lower alkyl groups of 1 to 4 carbon atoms such as methyl, ethyl or isopropyl, lower alkoxy groups such as rnethoxy, ethoxy and propoxy, fiuoro, chloro, bromo, iodo and trifluoromethyl, provided that A and A are not both hydrogen.

The basic starting materials employed in the preparation of the compounds of the present invention are {3-(3- thianaphthenyl)ethylamines of the formula in which A and A are as previously defined. The ethylamines may be prepared from the corresponding cyano compounds as described in the literature (Herz J .A.C.S. 72, p. 4999 (1950) and Pat. No. 855,115).

The ethylamine starting materials may also be prepared by treating the corresponding acid with thionyl chloride followed by treatment with sodium azide and 3,5 18 ,2 78 Patented June 30, 1970 acid hydrolysis. The process may be illustrated as follows:

B- 3- S-fluoro -thianaphthenyl] ethylamine,

B- 3- 6-fluoro -thianaphthenyl] ethylamine,

[3- 4-fluoro -thianaphthenyl] ethylamine,

3- 7-fluoro -thianaphthenyl] ethylamine,

3- S-chloro -thianaphthenyl] ethylamine,

3- 6-chloro -thianaphtheny1] ethylamine,

3- 4-chloro -thianaphthenyl] ethylamine,

3- 7-chloro -thianaphtheny1] ethylamine,

3- S-trifluoromethyl thianaphthenyl] ethylamine, 3 -(6-trifiuoromethy1)-thianaphthenyl]ethylamine, 3- 4-trifluoromethyl -thianaphthenyl] ethylamine, 3 7-trifluoromethyl) -thianaphthenyl] ethylamine, 3- 5 ,6-dimethoxy -thianaphthenyl] ethylamine,

- S-methoxy -thianaphthenyl] ethylamine,

- 6-methoxy -thianaphthenyl] ethylamine,

- 4-methoxy) -thianaphthenyl] ethylamine,

- 7-methoxy -thianaphthenyl ethylamine,

- 5 -hydroxy) -thianaphthenyl] ethylamine,

- 6-hydroxy -thianaphthenyl] ethylamine,

- 5 ,6-hydroxy -thianaphthenyl] ethylamine,

-[ (S-bromo -thianaphthenyl] ethylamine,

3- 6-bromo -thianaphthenyl] ethylamine, 13-[3-t 5-iodo)-thianaphthenyl]ethylamine, and ,8-[3-(6-iodo)-thianaphthenyl] ethylamine.

other suitable chemical reducing agent. The process may be diagrammed as follows:

' CH2-CH2NH2 l S A A1 I U \giaon /L AH in which A and A are as previously described.

Representative of the compounds which may be prepared by the described processes are the following:

6-fiuoro- 1,2,3,4-tetrahydrobenzothieno 2,3-c] pyridine, 7-fiuoro-1,2,3,4-tetrahydrobenzothieno [2,3 -c] pyridine, 5-fluoro-1,2,3 ,4-tetrahydrobenzothieno 2,3-c] pyridine, 8-fiuoro- 1 ,2,3,4-tetrahydrobenzothieno [2,3-c] pyridine, 6-chloro- 1 ,2,3,4-tetrahydrobenzothieno[ 2,3-c] pyridine, 7-chloro-1,2,3 ,4-tetrahydrobenzothieno 2,3 -c] pyridine, 5-chloro-1,2,3 ,4-tetrahyd robenzothieno 2,3-c] pyridine, 8-chloro-1,2,3 ,4-tetrahydro benzothieno [2,2-c] pyridine, 6-trifiuoromethyl-1,2,3,4-tetrahydrobenzothieno- [2,3-c] pyridine, 7-trifluoromethyl- 1,2, 3,4-tetrahydrobenzothieno- [2,3 -e] pyridine, 5 -trifiuoromethyll ,2,3 ,4-tetrahydrobenzothieno- [2,3-c] pyridine, S-trifluoromethyl-1,2,3,4-tetrahydrobenzothieno- [2,3-c] Pyridine, 6,7 -dimethoxy- 1 ,2,3,4-tetrahydrobenzothieno- [2,3-c] pyridine, 6-methoxy-1,2,3,4-tetrahydrobenzothieno- [2,3 -c] pyridine, 7-trifluoromethyl-1,2,4-tetrahydrobenzothieno- [2,3-c] pyridine, 5-methoxy-1,2,3 ,4-tetrahydrozenzothieno- [2,3 -c] pyridine, S-methoxy-1,2,3,4-tetrahydrobenzothieno- [2,3-c] pyridine, 6-hydroxy-1,2,3,4-tetrahydrobenzothieno- [2,3-c] pyridine, 7-hydroxy-1,2,3,4-tetrahydro-benzothieno- [2,3-c] pyridine, 6,7-dihydroxy-1,2,3 ,4-tetrahydrobenzothieno- [2,3-c] pyridine, 6-bromo-1,2,3 ,4-tetrahydrobenzothieno[ 2,3 -c] pyridine, 7-bromo-1,2,3 ,4-tetrahydrobenzothieno [2,3 -c] pyridine, 6-iodo- 1 ,2,3,4-tetrahydrobenzothieno 2,3-c] pyridine, and 7-iodo- 1,2,3,4-tetrahydrobenzotheno 2,3-c] pyridine.

Acid addition salts of the compounds of the present invention may be prepared by contacting the compounds with a suitable acid such as formic acid, citric acid, maleic acid, sulphuric acid, hydrochloric acid, succinic acid, tartaric acid, benzoic acid or fumaric acid.

The compounds of the present invention are useful as intermediates in the preparation of more complex chemical and pharmaceutical compounds. In addition, because of their antipsychotic properties, they are useful as pharmaceutical agents, per se. In animal tests the compounds have demonstrated an ability to control antisocial aggressive behavior. For example, the compound 6 chloro 1,2,3,4-tetrahydrobenzothieno[2,3-c]pyridine, which is representative of the class, has shown at a safe and effective dose of approximately 5 mg./kg. intraperitoneally, an ability to diminish or inhibit the antisocial behavior characteristics such as aggression, viciousness and persistence for fighting which is normally induced by isolation in mice. The compound was also found to have an LD in mice in excess of mg./kg. intraperitoneally in behavior studies conducted in the manner outlined by Irwin in Animal and Clinical Pharmacologic Techniques in Drug Evaluation, J. H. Nodine and P. E. Siegler, ed., Year Book Publishers, Inc. 1964, pp. 36-54.

When intended for use as pharmaceuticals the compounds are preferably employed in the form of their acid addition salt and are combined with a major amount of one or more suitable pharmaceutical diluents or additives and formed into unit dosage forms, such as capsules or tablets for oral administration or sterile solutions for parenteral administration. The unit dosage forms will generally contain a concentration of 0.1% to 10% or more by weight of one or more of the novel compounds. Generally such dosage forms will contain about 5 to 250 mg. of the active ingredients. One or more of such dosage forms may be administered daily; however, the amount administered will not normally exceed 100 mg./kg. of body weight of the intended recipient.

A typical tablet may have the following composition:

Powders 1, 2 and 3 are slugged, then granulated, mixed with 4 and 5 and tableted.

A suitable capsule might be obtained by filling a No. 3 hard gelatin capsule with a mixture of the following ingredients:

(1) 6 chloro 1,2,3,4 tetrahydrobenzothieno[2,3-

c]pyridine 10 (2) Lactose U.S.P. 195 (3) Starch U.S.P 16 (4) Talc U.S.P. 8

The following examples are presented to illustrate the invention:

EXAMPLE 1 a- (S-chloro-3-thianaphthenylmethyl) malonic acid To a solution of 45.2 g. of KOH in 45 ml. of water is added 100 ml. of ethanol and 45.2 g. (0.13 mole) of diethyl a-(5-chloro-3-thianaphthenylmethyl)malonate and the mixture is refluxed 22 hours. The alcohol is removed in vacuo after which 200 ml. of water is added and the mixture extracted twice with 100 ml. portions of ether. The aqueous solution is treated with activated charcoal, acidified with concentrated HCl and cooled. The solids are collected and dried to yield a-(5-chloro-3-thianaphthenylmethyl)malonic acid in the form of a yellow solid, M.P. -177".

Analysis.-Calcd. for C H ClO S (percent): S, 11.26. Found (percent): S, 11.42.

EXAMPLE 2 8- (5-chloro3-thianaphthenyl propionic acid a (S-chloro 3 thianaphthenylmethyl)malonic acid (13.5 g., 0.048 mole) is heated at -l95 for two hours. It is cooled to 25 and 75 ml. are dissolved. It is cooled, extracted twice with 35 ml. of chloroform, treated with activated charcoal and acidified with 10% HCl solution. The solids are collected, washed and dried to yield )3-(5-chl0ro-3-thianaphthenyl)propionic acid. An analytical sample is prepared by recrystallizing twice from ethanol and twice from methanol to yield B-(5-chloro-3- thianaphthenyl)propionic acid in the form of a yellow solid, M.P. 187189.

5 Analysis.--Calcd. for C H Cl S (percent): C, 54.91; H, 3.77; Cl, 14.74; S, 13.32. Found (percent): C, 55.09; H, 3.79; Cl, 14.83; S, 13.27.

EXAMPLE 3 ,3- (-chloro-3-thianaphthenyl)ethylamine hydrochloride A mixture of 26.8 g. (0.11 mole) of a-(5-chloro-3- thianaphthene)propionic acid and 57 g. (35 ml., 0.48 mole) of SOCl is heated to 50 in 0.5 hour and maintained at 50-52 for 1 hour. The excess SOCl is removed in vacuo. Benzene (50 ml.) is added to the residue and concentrated to yield 5(5 chloro-3-thianaphthenyl)propionyl chloride in the form of a yellow solid.

A mixture of 32 g. (0.12 mole) of ,8-(5-chloro-3-thianaphthenyl)propionyl chloride and 34 g. (0.51 mole) of NaN in 200 ml. of toluene is refluxed for 23.5 hours. The mixture is cooled, filtered and the filtrate concentrated to yield a brown oil.

To the above oil is added 100 ml. of concentrated HCl with stirring at 25 for 15 minutes, at 80 for 0.5 hour after which it is refluxed for 6 hours. The mixture is cooled to 25 and 100 ml. of ether added and stirred 0.5 hour. The solids are collected, washed with ether and dried to yield a solid, M.P. 215237. An analytical sample is prepared by recrystallizing from activated charcoaltreated ethanol to yield fl-(S-chloro 3 thianaphthenyl) ethylamine hydrochloride in the form of a white solid, M.P. 248-250.

An alysis.Calcd. for C H CI NS (percent): C, 48.38; H, 4.47; N, 5.64; S, 12.91. Found (percent): C, 48.18; H, 4.64; N, 5.48; S, 13.02.

EXAMPLE 4 6-ch1oro-1,2,3,4-tetrahydrobenzothieno [2,3-c] pyridine To a mixture of 2.39 g. (0.0113 mole) of 5-[3-(5- chloro)thianaphthenyl]ethylamine in ml. of water is added slowly 1.3 ml. of concentrated HCl. The solution is heated to 80 and 0.39 g. (0.0129 mole) of paraformaldehyde added in one portion after which heating continued for 1.25 hours at 8090. The mixture is cooled to 21, basified with 10% NaOH solution and extracted twice with 75 ml. portions of ether. The combined extracts are washed with brine, dried, and concentrated to yield a solid which is recrystallized twice from activated charcoal-treated 2-propanol to yield 6 chloro 1,2,3,4- tetrahydrobenzothieno[2,3-c] pyridine as White needles, M.P. 99-100.

Analysis.Calcd. for C H ClNS (percent): C, 59.06; H, 4.51; N, 6.25; S, 14.34.

EXAMPLE 5 When, in the procedure of Example 4, B-[3-(5-chloro) thianaphthenyl]ethylamine is replaced by an equal molar amount of [i- 3- S-fluoro -thianaphthenyl] ethylarnine,

,9- 3- 6-fluoro -thianaphthenyl] ethylarnine,

fl- 3- 4-fluoro -thianaphthenyl] ethylarnine,

18-] 3- (7 -fluoro -thianaphthenyl] ethylarnine,

3- 3- 5 -chloro -thianaphthenyl] ethylarnine,

,8- 3- 6-chloro )-thianaphthenyl] ethylarnine,

,B- [3- (4-chloro)-thianaphthenyl]ethylarnine,

[3- [3- 7-chloro) -thianaphthenyl] ethylarnine,

B- [3 (S-trifluo romethyl -thianaphthenyl] ethylarnine, fl- [3- 6-trifiuoromethyl) -thianaphthenyl] ethylarnine, 5- [3- 4-trifluoromethyl -thianaphthenyl] ethylarnine, ,8- [3- (7-trifluoromethyl) -thianaphtheny1] ethylarnine, 5- 3- (5 ,6-dimethoxy)-thianaphtheny1] ethylarnine,

fi- 3- S-methoxy) -thianaphthenyl] ethylarnine,

,8- [3- (6-methoxy) -thianaphthenyl] ethylarnine,

,8- [3- (4methoxy) -thianaphthenyl] ethylarnine,

,8- 3-(7-methoxy) -thianaphthenyl] ethylarnine,

,6- 3-(5-hydroxy) -thianaphthenyl] ethylarnine,

{3- [3-(6-l1ydroxy) -thianaphthenyl]ethylarnine,

,8- 3- (5 ,6-hydroxy) -thianaphtheny1 ethylarnine,

6 [3- [3 5 -bromo -thianaphthenyl ethylarnine, B- [3 6-bromo -thianaphthenyl] ethylarnine, ,8-[3-(5-iodo) -thianaphthenyl]ethylarnine, and 8- 3- 6-iodo -thianaphthenyl] ethylarnine,

respectively there are obtained,

6-fluoro-1,2,3 ,4-tetrahydrobenzothieno 2,3-c] pyridine,

7-fiuoro-1,2,3 ,4-tetrahydrobenzothieno [2, 3 -c] pyridine,

S-fluoro-l ,2,3,4-tetrahydrobenzothieno[2,3-c] pyridine,

8-fluoro-1,2,3 ,4-tetrahydrobenzothieno [2, 3-c pyridine,

6-chloro-1,2,3,4-tetrahydrobenzothieno [2,3-c] pyridine,

7-chloro- 1 ,2,3 ,4-tetrahydrobenzothieno [2,3-c] pyridine,

5-chloro- 1,2,3 ,4-tetrahydrobenzothieno [2,3-c] pyridine,

8-ch1oro- 1 ,2,3 ,4-tetrahydrobenzothieno 2, 3-c pyridine,

6-trifiuoromethyl- 1 ,2, 3 ,4-tetrahydrobenzothieno 2,3-c]

pyridine,

7-trifiuoromethyl-1,2,3 ,4-tetrahydrobenzothieno [2,3-c]

pyridine,

5 -trifiuoromethyl- 1 ,2,3 ,4-tetrahydrobenzothieno 2,3-c]

pyridine,

S-trifiuoromethyl- 1 ,2,3 ,4-tetrahydrobenzothieno 2,3-c]

pyridine,

6,7-dimethoxy-1,2,3 ,4-tetrahydrobenzothieno [2,3-c]

pyridine,

6-methoxy- 1,2,3 ,4-tetrahydrobenzothieno 2,3-c] pyridene,

7-methoxy- 1 ,2,3 ,4-tetrahydrobenzothieno [2,3-c] pyridine,

5 -methoxy- 1 ,2,3 ,4-tetrahydrobenzothieno 2,3-c 1 pyridine,

8-methoxy- 1 ,2, 3 ,4-tetrahydrobenzothieno [2,3-c] pyridine,

6-hydroxy-1,2,3,4-tetrahydrobenzothieno [2,3 -c] pyridine,

7-hydroxy-1 ,2,3,4-tetrahydrobenzothieno [2,3-c] pyridine,

6,7-dihydroxy-1,2,3,4-tetrahydrobenzothieno [2,3-c]

pyridine,

6-bromo-1,2,3 ,4tetrahydrobenzothieno [2,3-c pyridine,

7 -bromo- 1,2,3,4-tetrahydrobenzothieno [2,3 -c] pyridine,

6-iodo-1,2,3,4-tetrahydrobenzothieno[2,3-c]pyridine, and

7-iodo-1,2,3 ,4-tetrahydrobenzothieno [2,3-c] pyridine,

respectively.

I claim:

1. A compound selected from the group consisting of a compound of the formula wherein A and A, are selected from hydrogen, hydroxy, lower alkyl of 1 to 4 carbon atoms, lower alkoxy, fluoro, chloro, bromo, iodo and trifluoromethyl, provided that A and A are not both hydrogen, and the pharmaceutically acceptable acid addition salts thereof.

2. A compound of claim 1 in which A and A are selected from fluoro, chloro and trifluoromethyl.

3. A compound of claim 1 in which A is hydrogen and A is selected from chloro, fluoro and trifluoromethyl.

4. A compound of claim 1 in which A is hydrogen and A is selected from alkoxy and hydroxy.

5. A compound of claim 1 in which A and A are both hydroxy or alkoxy.

6. A compound of claim 1 in which A is hydrogen and A is chloro.

References Cited Capps et al., J. Am. Chem., Soc., vol. 75, pp. 697-699, 1953.

Kotake et al., Chemical Abstracts, vol. 46, co]. 6l21-b, 1952.

HENRY R. JILES, Primary Examiner A. L. ROTMAN, Assistant Examiner US. Cl. X.R.

7 33" UNITED STATES PATENT OFFICE (IER'IIFICA'IE ()F CORRECTION Pun-mt N0, l lj' fl" Dated July 21, 1970 Inventofls) JOhn T Suh It is certified that error appears in the above-identified patent: and that said Letters Patent are hereby corrected as shown below:

Elolumn 1, line 2 "Thieno 2,3-Pyridine" should read Thieno[2,3-c]Pyridine Column 3, lines 1 L to 19 n A Column 3, line M "T-trifluoromethyl-l,2,3-tetrahydrobenzothieno-" should read 7-methoxy-l,2, 3,4-tetrahydrobenzothieno- Sill IE5} Ans-1 MALE I 11M I 505mm 0 m M 0 Oomissiousr of Pat nts 

